1 June 1992 Ester degradation in the DESIRE process
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This paper attempts to investigate the possible degradation of the ester formed in PLASMASK 200G photoresist during extended silylation times with HMDS (hexamethyldisilazane). The breakdown of the ester results in the formation of a phenolic moiety and an amide. This may lead to silylation of this newly released phenolic OH-group in the unexposed regions, and hence a decrease in the contrast might occur. This would have a detrimental effect on critical dimension (CD) control. It was found that under higher ammonia concentrations, an ester degrades to release a phenolic group and also an amide. The silylation times involved are much greater than that used in the DESIRE process, and as such degradation of the ester in the DESIRE process is itself quite minimal. It is, however, suggested that a silylating agent that does not form a base on cleavage be used instead to reduce the degradation effect.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. P. O'Neil, J. P. O'Neil, Khalil I. Arshak, Khalil I. Arshak, Robert Jan Visser, Robert Jan Visser, } "Ester degradation in the DESIRE process", Proc. SPIE 1672, Advances in Resist Technology and Processing IX, (1 June 1992); doi: 10.1117/12.59737; https://doi.org/10.1117/12.59737

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